Ben decides to start a business walking dogs and cleaning swimming pools. It
takes him 15 minutes to walk one dog and 20 minutes to use a skimmer and clean
one swimming pool.



Which expressions would represent how long it would take ben to walk some dogs and clean some swimming pools?

A.
15+20

B.
15x + 20x

C.
35 + 20x

D.
20 + 35 + 2